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AMZN was $1,010 on 2017-Jul-17. Right now it's $1,813. That's a ~80% increase, so it's extremely plausible that his net worth went up by 50% (in fact, I'm surprised it didn't go up by more).

It went up by 50%, not 150. You do that by having most of your net worth in a high performing stock. Of course, in 3 weeks we may see an article about how bezos lost $50B in one day due to the same reason.

There is more money in circulation and it needs somewhere to go. Investors put it in stocks. This is part of the reason the entire market has risen, amzn is just at the front of it.

Wouldn't it be +50%? Doesn't seem unreasonable.

That's a pretty steep rise in a short time for any asset though.

Amazon's share price was mid 900s in Sept 2017...1800+ today. When you own a lot of that stock...

So it's similar to the $CURRENT_FAD coin valuations in that if Bezos were to try to liquidate all of his position it certainly wouldn't net him that publicised amount because there's not that much liquidity.

If he was $100 and went to $150 his net worth went up 50% surely? 100% is doubling....